某U形混凝土地下室伸缩缝开裂原因及设计方法探讨

Discussion on Cracking Reason and Design Method of Expansion Joint in a U-Shaped Concrete Basement

本文就某种U形混凝土地下室伸缩缝开裂进行了介绍和探讨,用SAP2000分析了该伸缩缝开裂的机理,由于沿伸缩缝长度方向两侧的刚度不同,造成伸缩缝挂板在温度荷载作用下内力和变形不协调,因此出现开裂。对该伸缩缝设计方法做了初步的浅析,在裂缝开展分析的基础上,给出了该类伸缩缝的概念设计方法,最后建议今后的工程应尽量避免使用同类型的伸缩缝。

This paper introduces and discusses the cracking mechanism of expansion joint of a U-shaped concrete basement, and analyzes the cracking mechanism of the expansion joint with SAP2000. Due to the different stiffness on both sides along the longitudinal direction of the expansion joint, the internal force and deformation of the hanging plate of the expansion joint are not coordinated under the action of temperature load, which leads to the cracking. The design method of this kind of expansion joint is preliminarily analyzed. On the basis of crack development analysis, the conceptual design method of this kind of expansion joint is given. Finally, it is suggested that the same type of expansion joints should be avoided to be used in future projects.